Different manometer used in fluid mechanics

A manometer is a transparent tube containing a liquid of known density used for the purpose of measuring the fluid pressure. The common fluids used are mercury, alcohol.

Simple manometer, one end is connected to the point at which the pressure is to be measured and the other end is open to atmosphere.


Differential manometer, two ends are connected to the points whose ‘difference of pressure’ is to be measured. 

Micro-manometer a large difference in meniscus levels are obtained for very small pressure difference. This manometer is useful for precise measurement of pressure difference.